scholarly journals Susceptibility of Enamel Treated with Bleaching Agents to Mineral Loss after Cariogenic Challenge

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Hüseyin Tezel ◽  
Cigdem Atalayin ◽  
Ozlem Erturk ◽  
Ercument Karasulu
Keyword(s):  
Hydrogen Peroxide ◽  
Inductively Coupled Plasma ◽  
The Other ◽  
Clinical Aspects ◽  
Control Group ◽  
Carbamide Peroxide ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
And Control ◽  
Calcium Loss

Objectives. Controversial reports exist whether bleaching agents cause a susceptibility to demineralization. The aim of this study was to compare the calcium loss of enamel treated with different bleaching agents and activation methods.Method and Materials. The specimens obtained from human premolars were treated in accordance with manufacturer protocols; 10% carbamide peroxide, 38% hydrogen peroxide light-activated, 38% hydrogen peroxide laser-activated, and no treatment (control). After cariogenic challenge calcium concentrations were determined by Inductively Coupled Plasma Mass Spectrometry.Results. No differences were found between the calcium loss of the laser-activated group and 10% carbamide peroxide group (). However, the differences between laser-activated and control groups were statistically significant (). The differences between 10% carbamide peroxide and the control group were not significant (). On the other hand, the light-activated group showed a significantly higher calcium loss compared with the other groups ().Conclusions. The results show that bleaching agents may cause calcium loss but it seems to be a negligible quantity for clinical aspects.

scholarly journals Trace elements and rat pouchitis.

2012 ◽  
Vol 59 (4) ◽  
Author(s):  
Sławomira Drzymała-Czyż ◽  
Tomasz Banasiewicz ◽  
Stanisław Walas ◽  
Tomasz Kościński ◽  
Ewa Wenska-Chyży ◽  
...  
Keyword(s):  
Trace Elements ◽  
Restorative Proctocolectomy ◽  
Inductively Coupled Plasma ◽  
Complete Removal ◽  
Control Group ◽  
Slight Reduction ◽  
Inductively Coupled ◽  
The Status ◽  
Plasma Mass Spectrometry ◽  
Inflammatory Changes

The procedure of restorative proctocolectomy is associated with a complete removal of the colon and slight reduction of ileum length, which together can lead to systemic shortages of trace elements. Inflammatory changes in the pouch mucosa may also have some impact. However, there is no data on trace elements in pouchitis. Therefore, in the present study we aimed to assess the effect of acute pouchitis on the status of selected trace elements in rats. Restorative proctocolectomy with the construction of intestinal J-pouch was performed in twenty-four Wistar rats. Three weeks after the surgery, pouchitis was induced. Eight untreated rats created the control group. Liver concentrations of selected micronutrients (Zn, Cu, Co, Mn, Se) were measured in both groups six weeks later, using inductively coupled plasma mass spectrometry. Liver concentrations of trace elements did not differ between the study and the control groups. However, copper, cobalt and selenium concentrations [μg/g] were statistically lower (p

scholarly journals Influence of a 6-month physical training program on serum and urinary concentrations of trace metals in middle distance elite runners

2019 ◽  
Vol 16 (1) ◽  
Author(s):  
M. Maynar ◽  
I. Bartolomé ◽  
J. Alves ◽  
G. Barrientos ◽  
F. J. Grijota ◽  
...  
Keyword(s):  
Training Program ◽  
Physical Training ◽  
Inductively Coupled Plasma ◽  
Time Effect ◽  
The Body ◽  
Control Group ◽  
Adaptive Responses ◽  
Inductively Coupled ◽  
Time Interaction ◽  
Plasma Mass Spectrometry

Abstract Background The aim of this survey was to determine the effects of an aerobic physical training program of six months duration on the serum and urinary concentrations of essential trace elements among middle distance runners and untrained, non-sportsmen participants. Methods 24 well-trained, middle-distance (1500 and 5000 m), aerobic male runners (AG) were recruited at the beginning of their training season and 26 untrained males formed the control group (CG). All participants were from the same region of Spain, and all of them had been living in this area for at least two years. Serum and urine of samples of Cobalt (Co), Copper (Cu), Manganese (Mn), Molybdenum (Mo), Selenium (Se), Vanadium (V) and Zinc (Zn) were obtained at the beginning of the training season, and six months later, from all participants. All samples were analyzed with inductively coupled plasma mass spectrometry (ICP-MS). Results Two-way ANOVA showed significant differences relative to group effect in serum concentrations of Co, Cu, Mn, Mo, Se and Zn. Attending to time effect, there were differences in Mn (p = 0.003) and Zn (p = 0.001). The group x time interaction revealed differences only in the case of Mn (p = 0.04). In urine, significant differences between group were obtained in Co, Cu, Mn, Se and V. Time effect showed changes in Co, Cy, Mo and Se. Finally, the group and time interaction revealed significant differences in urinary Cu (p = 0.001), Mn (p = 0.01) and Se (p = 0.001). Conclusions A six-month aerobic training program for well-trained athletes induced modifications in the body values of several minerals, a fact which may reflect adaptive responses to physical exercise. The obtained data could be interesting for physicians or coaches in order to consider specific modifications in sportsmen’s diets as well as to determine specific nutritional supplementation strategies.

scholarly journals Hair Mercury Levels Detection in Fishermen from Sicily (Italy) by ICP-MS Method after Microwave-Assisted Digestion

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Giuseppe Giangrosso ◽  
Gaetano Cammilleri ◽  
Andrea Macaluso ◽  
Antonio Vella ◽  
Nicolantonio D’Orazio ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Total Mercury ◽  
Control Group ◽  
Inductively Coupled ◽  
Hair Mercury ◽  
Icp Ms ◽  
Hair Samples ◽  
Significant Difference ◽  
Close Relationship ◽  
Plasma Mass Spectrometry

A number of ninety-six hair samples from Sicilian fishermen were examined for total mercury detection by an Inductively Coupled Plasma Mass Spectrometry (ICP-MS) method. The mercury levels obtained were compared with mercury levels of 96 hair samples from a control group, in order to assess potential exposure to heavy metals of Sicilian fishermen due to fish consumption and closeness to industrial activities. Furthermore, the mercury levels obtained from hair samples were sorted by sampling area in order to verify the possible risks linked to the different locations. The overall mean concentration in the hair of the population of fishermen was6.45±7.03 μg g−1, with a highest value in a fisherman of Sciacca (16.48 μg g−1). Hair mercury concentration in fishermen group was significantly higher than in control group (p<0.01). There was no significant difference in hair total mercury concentrations between sampling areas (p>0.05). The results of this study indicate a greater risk of exposure to mercury in Sicilian fishermen, in comparison to the control population, due to the high consumption of fish and the close relationship with sources of exposure (ports, dumps, etc.).

scholarly journals Copper concentration in erythrocytes, platelets, plasma, serum and urine: influence of physical training

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Víctor Toro-Román ◽  
Jesús Siquier-Coll ◽  
Ignacio Bartolomé ◽  
Francisco J. Grijota ◽  
Diego Muñoz ◽  
...  
Keyword(s):  
Physical Training ◽  
Inductively Coupled Plasma ◽  
Training Group ◽  
Control Group ◽  
Inductively Coupled ◽  
Professional Soccer ◽  
Training Plan ◽  
Intracellular Compartments ◽  
Plasma Mass Spectrometry ◽  
High Level

Abstract Background Physical training produces changes in the extracellular and intracellular concentrations of trace minerals elements. To our knowledge, only three compartments have been studied simultaneously. The aim of the present study was to analyze the influence of physical training on extracellular (serum, plasma and urine) and intracellular (erythrocytes and platelets) concentrations of Copper (Cu). Methods Forty young men participated in this study. The participants were divided into a training group (TG; n = 20; 18.15 ± 0.27 years; 68.59 ± 4.18 kg; 1.76 ± 0.04 m) and a control group (CG; n = 20; 19.25 ± 0.39 years; 73.45 ± 9.04 kg; 1.79 ± 0.06 m). The TG was formed by semi-professional soccer players from a youth category with a regular training plan of 10 h/week. All of them had been participating in high level competitions and had trained for at least 5 years. Plasma, serum, urine, erythrocyte and platelet samples of Cu were obtained and analyzed by inductively coupled plasma mass spectrometry (ICP-MS). Results The TG showed lower concentrations of Cu in erythrocytes (p < 0.05) despite similar intakes. There were no significant differences in Cu concentrations in plasma, serum, urine and platelets although the trend was similar to that observed in erythrocytes. Conclusions The assessment of trace element concentrations should be carried out in both extracellular and intracellular compartments to obtain a proper evaluation and to identify possible deficiencies of the element. We believe that additional Cu supplementation is needed in athletes who perform physical training regularly.

scholarly journals Effect of Four Bleaching Regimens on Color Changes and Microhardness of Dental Nanofilled Composite

2009 ◽  
Vol 2009 ◽  
pp. 1-7 ◽  
Author(s):  
Simone Xavier Silva Costa ◽  
Anne Buss Becker ◽  
Alessandra Nara de Souza Rastelli ◽  
Leonor de Castro Monteiro Loffredo ◽  
Marcelo Ferrarezi de Andrade ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Vickers Hardness ◽  
Artificial Saliva ◽  
Control Group ◽  
Carbamide Peroxide ◽  
Mean Values ◽  
Color Changes ◽  
Before And After ◽  
And Control ◽  
Cielab Color

Objective. The purpose of this study was to compare the color changes and microhardness of a nanocomposite after four bleaching regimens.Materials. Twenty-five specimens(n=25)were made with a nanocomposite resin (Filtek Supreme XT). The specimens were divided into five groups equally(n=5): bleaching groups and control group, as follows: G1: artificial saliva at37∘C; (control) G2: hydrogen peroxide (HP) at 7%; G3: hydrogen peroxide (HP) at 35%; G4: carbamide peroxide (CP) at 10%; G5: carbamide peroxide (CP) 35%. Color measurements were made with spectrophotometer using CIELAB color scale. The Vickers hardness (VHN) measurements were performed at the top surface. The data were analyzed with two-way Analysis of Variance.Results.ΔE and VHN mean values into the groups were not statistically different, however, the VHN mean values before and after storage and bleaching showed statistically significant differences.Conclusion. Nanocomposite samples showed no significant alteration (color and microhardness) after bleaching. Thus, no replacement of restorations is required after bleaching.

scholarly journals Edemogenic test and hydrogen peroxide degradation rate of bleaching gels with different desensitizing agents

2018 ◽  
Vol 21 (2) ◽  
pp. 157
Author(s):  
André Luiz Fraga Briso ◽  
Marjorie Oliveira Gallinari ◽  
Francine Benetti ◽  
Diego Valentim ◽  
Carlos Roberto Emerenciano Bueno ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Vascular Permeability ◽  
Subcutaneous Tissue ◽  
The Other ◽  
Tooth Bleaching ◽  
Control Group ◽  
Carbamide Peroxide ◽  
Desensitizing Agents ◽  
Bleaching Gels ◽  
At Home

<p><strong>Objective</strong>: The at-home bleaching technique leads to the intimate contact of the bleaching gel with gingival tissues, so this study evaluated the immediate inflammatory response, through the edemogenic test, induced by at-home bleaching gels of 10% carbamide peroxide with different desensitizing agents, the quantification of hydrogen peroxide released and bleaching gels pH. <strong>Material</strong> <strong>and</strong> <strong>Methods</strong>: Forty-eight rats were divided into groups (n=12): CTRL-control group, WP-Whiteness Perfect 10% (FGM Produtos Odontológicos, Joinville, SC, Brazil), OPA-Opalescence 10% (Ultradent Products Inc., South Jordan, IT, USA), and PB-Power Bleaching (BM4, Palhoça, SC, Brazil). For the edemogenic test, all rats received an intravenous injection of Evan's Blue; after 30 min, 0.2 mL of each bleaching gels was injected into the subcutaneous tissue of the rats, and the results of the vascular permeability were assessed after 3 and 6h. The amount of HP released and pH of each product was also determined. Data were submitted to statistical test (<em>p</em>&lt;0.05). <strong>Results</strong>: At 3h, the PB showed higher vascular permeability than the other groups. At 6h, the PB produced similar vascular permeability than WHI, and higher than OPA and CTRL groups. The OPA group had a higher vascular permeability at 6h compared to 3h; there is no difference in other groups. The PB group had higher HP concentrations than the other groups. <strong>Conclusion</strong>: In general, the PB caused a more considerable amount of inflammatory edema and higher amount of HP released. This results suggesting that these bleaching gels cause greater aggression in soft gingival tissues that eventually ends up in contact with bleaching products</p><p> </p><p class="CorpoA"><strong>Keywords</strong><strong></strong></p><p class="CorpoA">Tooth bleaching; Carbamide peroxide; Hydrogen peroxide; Capillary permeability.</p>

scholarly journals A culture-based calibration of benthic foraminiferal paleotemperature proxies: δ<sup>18</sup>O and Mg/Ca results

2010 ◽  
Vol 7 (4) ◽  
pp. 1335-1347 ◽  
Author(s):  
H. L. Filipsson ◽  
J. M. Bernhard ◽  
S. A. Lincoln ◽  
D. C. McCorkle
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Temperature Dependence ◽  
Benthic Foraminifera ◽  
Inductively Coupled Plasma ◽  
The Other ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Predicted Values ◽  
Increasing Temperature

Abstract. Benthic foraminifera were cultured for five months at four temperatures (4, 7, 14 and 21 °C) to establish the temperature dependence of foraminiferal calcite δ18O and Mg/Ca. Two Bulimina species (B. aculeata and B. marginata) were most successful in terms of calcification, adding chambers at all four temperatures and reproducing at 7 and 14 °C. Foraminiferal δ18O values displayed ontogenetic variations, with lower values in younger individuals. The δ18O values of adult specimens decreased with increasing temperature in all but the 4 °C treatment, exhibiting a relationship consistent with previous δ18O paleotemperature calibration studies. Foraminiferal Mg/Ca values, determined by laser ablation inductively coupled plasma mass spectrometry, were broadly consistent with previous Mg/Ca calibration studies, but extremely high values in the 4 °C treatment and higher than predicted values at two of the other three temperatures make it challenging to interpret these results.

Sign in / Sign up

Export Citation Format

Share Document